Assessment of extent of damage and yield loss caused by stem borer in rice

Abstract

A field experiment was conducted at Krishi Vigyan Kendra, Basuli, Maharajganj, to assess the extent of damage and yield loss due to the infestation of Stem borer in rice during kharif 2018. Seven popular high yielding strains viz. Arize 6444 Gold, NDR 359, MTU 7029, BPT 5204, 27 P 63, Gorakhnath 509 NDR 2065 and local popular variety, Kalanamak were used as test variety. Among several species of stem borer infesting rice crop, yellow stem borer Scirpophaga incertulas (Walker) was found relatively in high abundant at all the stages of crop growth. Among tested rice varieties Kalanamak was found most susceptible to Stem Borer attack resulted in higher% dead hearts (15.45%) at tillering stage and higher% white year (27.30%) at maturity stage. Quantitative yield loss increased with the increase of the borer's infestation. Highest yield loss was quantified for the rice variety, Kalanamak (34.37%) followed by BPT 5204 (20.48%) and NDR 2065 (17.35%).